Abstract
A new geometry is proposed for an antenna producing circularly polarized (CP) conical beam with wide 3 dB axial ratio (AR) beamwidth. A coaxial-line waveguide 8-way power divider has been employed to feed eight helixes. The symmetrically placed helixes around the sphere control the circular polarization purity. The locations, dimensions, and spin angles of the helixes are tuned to achieve wide 3-dB AR beamwidth. The simulated results show that the proposed antenna achieves an impendance bandwidth of 16.6% from 32.1 GHz to 37.9 GHz with the gain no less than 6.36 dBic at 30°, and 3dB AR beamwidth steadily covers from 1° to 58° over the bandwidth. The proposed antenna has a compact size of 11mm $\times 11$ mm $\times 8.2$ mm, which will be useful in satellite communication applications.
Published Version
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